...hi Snowflake....good to hear from you but sorry it's because the beast is screwing with you...
...i don't know how common this is with CH, but have seen it mentioned several times, mostly as a side note in research and medical articles/papers....and on occasion in discussion by clusterheads.....you aint any more cracked than the rest of us! it's a thing, but apparently moreso with migraineurs. not reported to be harmful beyond annoyance in anything i've read...
...i made my living with my nose so it was more intriguing than alarming for me...tho i must admit it pissed me off and i used to hunt down the source until i finally figured out "And no one else can smell it. It feels like it is coming from within myself even exhaling through the nose senses it." thankfully transient, so never interfered with the job. multiple variations but burnt plastic, manure, and sewage were the most common and yuckiest. it IS the weirdest damn thing.....
...never could associate with any particular med and not recalling at what point in cycle it was prevalent...or even when ECH, if only during cycle...